docs: fix textile-style links in channel rules table

[SimonWoolf]

Summary

• Convert three textile-style links (\"text\":/url) to markdown links in the 'Message annotations, updates, deletes, and appends' row of the channel rules table on docs/channels.

Test plan

• Verify links render correctly on the channels page

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[m-hulbert]

LGTM thanks (CI failure is unrelated and I've re-run).